Thermal Fogging Machine and a Complete Aedes Control Plan for Local Governments: 3 Keeps, 3 Diseases, and Well-Timed Spraying Within 100 Meters of Patient Homes

Owning a mosquito fogger is not enough. What actually breaks an outbreak is a plan that links breeding-site removal with fogging at the right time, over the right radius and in the right number of rounds. This article sets out that plan step by step, together with a suitable tool: the AIROFOG AT35.

They Sprayed, But New Cases Kept Coming

(Illustrative scenario) Wipawan is a public health officer at a subdistrict administrative organization in central Thailand. Her subdistrict includes canal-side villages, a small housing estate and two agricultural processing plants. In early July, the local subdistrict health promoting hospital reported a dengue case in Village 4: a ten-year-old girl. The local government team went out to fog the next day at two in the afternoon, because that was when staff were free from other duties. They sprayed only the patient's house and a few neighbors, then considered the job done.

Ten days later, three new cases appeared in the same lane, plus another in the housing estate roughly eighty meters away. The village headman phoned: "You already sprayed, didn't you? Why are more people getting sick?" Messages began circulating in the village LINE group saying the spraying had been "just for show," and the chief executive of the local government called Wipawan in for an explanation.

Looking back, Wipawan realized the problem was not a lack of effort from staff. The problem was that there was no plan. Spraying happened once. It did not cover the proper radius. It took place when Aedes mosquitoes were not active. There was no second round, no larval survey and no campaign to get residents to remove breeding sites. On top of that, the old thermal fogger kept stalling and had to be rested mid-job. Mosquitoes that survived the spraying, and new ones emerging from larvae, simply carried the transmission cycle forward.

This situation is not unique. Many local administrative organizations across Thailand face something similar: they have a mosquito sprayer, chemicals and staff, but the pieces are not joined into a single system. This article gathers practical guidance local governments can adapt, from preparation before the outbreak season, through the response to a reported case, to evaluation afterward.

The Damage Done When Aedes Control Is Not Systematic

Public health

The Aedes mosquito carries dengue, chikungunya and Zika virus, which Thailand's Department of Disease Control groups together as the "3 diseases" preventable through managing Aedes and their breeding sites. Dengue causes a high, persistent fever for two to seven days, headache and muscle pain, sometimes with small bleeding spots under the skin, and the phase that needs the closest watching is when the fever falls, because shock can develop. Chikungunya causes severe joint pain that can make walking difficult, sometimes for months. Zika may affect the unborn babies of infected pregnant women. Children, older adults, people with chronic illness and pregnant women need particular care.

When control is not continuous, mosquitoes that picked up the virus from the first patient go on to bite people in neighboring homes, creating a cluster of cases in the same lane or village. A cluster is many times harder to control than breaking the cycle at the start.

Wasted budget

Spraying once and then having to return because of a second, third and fourth case wastes chemical, fuel, overtime pay and staff time. Patients' families lose income while caring for sick children. The total cost to the community ends up far higher than investing in good planning from the start.

Public image and trust in local government

Residents do not judge performance by how many times a team sprayed; they judge it by whether people are still getting sick. When new cases follow spraying, confidence in leaders and staff drops immediately, and comparisons are quickly drawn with neighboring subdistricts that seem to control outbreaks better.

Complaints on social media

Messages such as "they only sprayed for show" or "they sprayed in the afternoon when the mosquitoes were hiding" spread quickly in LINE groups and community pages. Sometimes there are video clips of a fogger sputtering or stalling in the street. The local government then spends its time explaining rather than controlling disease.

Overloaded staff

Without a plan, every case becomes an emergency handled on the fly. Staff drop other work and scramble to find people to carry the machine, fuel and chemicals. With a clear plan, everyone knows their role: village health volunteers know which households to survey for larvae, and the spraying team knows what time to start, what radius to cover and which day to return for the next round.

Why the Old Approach Fails to Break the Cycle

One spray and done. Aedes eggs stuck to the inside walls of containers can hatch into larvae and develop into adult mosquitoes within about a week in hot, humid weather. A single spraying round has no effect on the new generation that emerges afterward.

Too narrow a radius. Aedes mosquitoes do not fly very far, but they do move between several homes in the same neighborhood. Spraying only the patient's house and next-door neighbors misses the area where infected mosquitoes may be living. That is why common practice is to spray around the patient's home within a radius of about 100 meters.

The wrong time of day. Aedes bite during the day, with peaks in the early morning and late afternoon. Fogging on a hot afternoon causes the fog to rise and disperse too fast, while mosquitoes hide in the shade or indoors. Results are poor.

Not spraying indoors. Aedes like to rest in dark, sheltered spots inside homes: under beds, behind cupboards and among hanging clothes. Spraying only outside leaves these resting mosquitoes untouched. Arranging with residents to open doors and windows and allow indoor fogging is essential.

Not removing breeding sites. Fogging kills only adult mosquitoes. Larvae in water jars, plant saucers, old tires and discarded containers remain. Without the 3 Keeps measures alongside spraying, the cycle always restarts.

Equipment that is not ready. An old thermal fogger with a corroded body, unreliable ignition and uneven fog, or a cheap machine with no spare parts or after-sales service, forces teams to stop midway and leaves the planned radius incomplete.

A Complete Five-Step Aedes Control Plan for Local Governments

Step 1: Prepare before the outbreak season

The weeks before the rainy season are the most valuable. Check every thermal fogger and ULV cold fogger: start each one, inspect nozzles, chemical lines and fuel systems. Stock properly registered chemicals and personal protective equipment. Prepare a village map marking risk points such as schools, child development centers, temples, markets, factories and communities that reported cases in previous years. Assign responsibilities and agree a case-notification channel with the subdistrict health promoting hospital.

Step 2: Drive the "3 Keeps, Prevent 3 Diseases" measures

The Department of Disease Control's 3 Keeps are: keep the house clean, airy and free of dark resting spots; keep waste collected, especially anything that can hold water such as cans, bottles, old tires and coconut shells; and keep water covered, sealing storage containers and changing water in vases and plant saucers at least once a week. Together they help prevent the three diseases: dengue, chikungunya and Zika.

Local governments can drive these measures through village health volunteers, who survey household larvae every week, and through community Big Cleaning Days, schools and temples acting as role models, and regular reminders over village loudspeakers and LINE groups. Fogging only reaches its full effect once breeding sites have been reduced.

Step 3: Respond quickly when a case is reported

When a confirmed or suspected case is reported, get into the field as fast as possible. Disease control guidance generally aims for action within about 24 hours of notification. The team should work with local health staff to find out where the patient went before falling ill, such as school, relatives' homes or a workplace, to judge whether more than one location needs control. Residents within the spraying radius should be informed in advance.

Step 4: Fog within 100 meters of the patient's home, with the right timing

Radius. Treat the patient's home as the center and cover every house within roughly 100 meters, both inside and around each home, including shrubs, the space under raised houses, sheds and vacant overgrown land where mosquitoes may rest. A simple sketch map listing the houses in the radius, ticked off as each one is done, prevents gaps.

Timing. Choose early morning or late afternoon, when Aedes are active and the air is fairly still, with little wind and no rain. The fog stays low and lingers long enough to contact mosquitoes. Avoid the heat of midday.

Rounds. New mosquitoes will emerge from remaining eggs and larvae, so widely used guidance recommends repeat spraying, typically at least two rounds about seven days apart, or as directed by local health authorities. Between rounds, village health volunteers should intensify larval surveys and breeding-site removal within the same radius.

Communicating with residents. Ask households in advance to cover food and drinking water, move small children, sick people, pets and bird cages out temporarily, open doors, windows and cupboards so the fog can reach inside, extinguish open flames, and wait before re-entering according to the chemical label's instructions.

Step 5: Follow up and evaluate

After each round, record the date and time, the number of houses treated, the amount of chemical used and larval survey results before and after. Keep watching for new cases at least until the period of possible onward transmission has passed. If no new cases appear, the cycle has been broken. These records also support reports to leadership and the council, and provide evidence for next year's budget request.

An Action Timeline After a Case, and Who Does What

• Day of notification: receive case details from the health promoting hospital or hospital, confirm the address, mark the center and the 100-meter radius on a map, ask village health volunteers to inform households in the radius, and prepare the fogger, chemicals and protective gear.
• Early morning or evening of the next day: carry out the first fogging round, covering every house inside and out. Volunteers survey for larvae, tip out containers and add larvicide to stored water.
• Between rounds: monitor people in the patient's home and neighboring homes; anyone with fever should see health staff promptly. Promote the 3 Keeps through loudspeakers and LINE groups.
• About seven days after the first round: fog the same radius again and repeat the larval survey to compare results.
• Following weeks: continue surveillance. If a new case appears, start a new cycle centered on that home. If not, summarize results and report to leadership.

Local government leaders approve the plan, allocate equipment and materials budgets, and communicate with the public. The public health officer coordinates, sequences spraying, controls chemical use and writes reports. The spraying team keeps machines ready, works to the set times and radius, and always wears protective equipment. Village health volunteers are the front line for notification, larval surveys and encouraging the 3 Keeps. Health promoting hospitals and hospitals share case data quickly and give technical advice. And residents make the plan succeed by opening their homes for fogging and managing their own water containers every week.

The Tool That Makes the Plan Real: AIROFOG AT35 Stainless Steel Thermal Fogger

A good plan needs equipment that works every time it is called on. The AIROFOG AT35 is a thermal fogging machine with a body made entirely of stainless steel. It is lightweight, works with both water-based and oil-based chemicals, and is certified in Germany and the United Kingdom. It is suitable for homes, factories, hospitals and public areas.

Why AT35 fits the 100-meter plan

• Fog reaches mosquito resting sites under houses, in shrubs, in gaps between buildings and inside rooms, where Aedes like to hide.
• Light weight lets staff carry it house by house across the whole radius without excessive fatigue, so coverage is genuinely complete rather than limited to the street.
• 100 percent stainless steel body withstands combustion heat and chemicals, reducing the corrosion problems common in older machines.
• Water- and oil-based chemical compatibility lets the local government choose the formulation that suits each area, such as water-based products where less odor and residue is preferred.
• Certification from Germany and the UK provides quality evidence to support procurement decisions.
• Versatility across communities, housing estates, factories, hospitals and public spaces within the local government's area.

All of this comes with the standards of World Health Disinfection Co., Ltd. (WHD): ISO and GMP certification, a 100 percent quality check before delivery, full after-sales service with technicians and spare parts, and compliance with Thai government equipment standards.

10 Reasons Local Governments Make AT35 the Core of Their Aedes Plan

1. Same-day readiness. Light and portable, so a two-person team can respond immediately.
2. Full 100-meter coverage. Staff can fog every house, inside and out, without gaps.
3. Deep fog penetration. It reaches dark corners, under beds, beneath houses and into shrubs where adult mosquitoes hide.
4. Built for repeat rounds. The all-stainless body handles heavy use throughout the outbreak season.
5. Chemical flexibility. Water- or oil-based formulations can be chosen to suit each area.
6. Documented quality. German and UK certification gives procurement committees clear evidence.
7. Many missions. Communities, schools, factories and public spaces, covering control of flying insects generally according to the chemical used.
8. Fewer complaints. Consistent fog without mid-job stalls shows residents the local government means business.
9. Technicians and parts on hand. WHD's full after-sales service lowers the risk of breakdowns during a crisis.
10. Works well with other machines. Pair it with the cordless AIROSTAR ULV sprayer for quiet indoor spaces, or the vehicle-mounted UM2 for main roads, to build a complete vector control system. See the AT35 thermal fogging machine for details.

Before and After Systematic Aedes Planning

Procurement Tips to Support Your Aedes Control Plan

Size the fleet from the plan, not from habit

Estimate how many locations might need control at the same time at the peak of the season, how many households fall within each 100-meter radius, and the need for repeat rounds. With only one machine, the team must choose which site to visit first, and some sites wait. Having at least two thermal foggers, or one main unit and one backup, keeps the plan moving even when one machine is being serviced.

Items to consider in the specification (TOR)

• Thermal fogger type and a body material resistant to heat and corrosion.
• Compatibility with both water-based and oil-based chemicals.
• Weight and ease of carrying through communities.
• Product quality certification and supplier standards such as ISO and GMP.
• Warranty, spare parts availability and in-country service or technicians.
• Training in operation, safety and basic maintenance for operators.

Write specifications fairly, without naming brands, and follow the procurement regulations in force at the time, consulting the procurement officer at each step.

Budget for both equipment and materials

An Aedes plan needs more than a machine. Set an equipment budget line for the foggers, and a materials line for adulticides, larvicides, fuel, personal protective equipment and campaign materials such as leaflets and banners on the 3 Keeps, plus an annual maintenance allowance, so the plan never stalls for want of one component.

Train the team and rehearse before the rains

On delivery day, ask the supplier to demonstrate starting, mixing chemicals according to the label, safe spraying, correct shutdown and cleaning. Then run a full rehearsal in one pilot village, from receiving notification and informing residents to fogging the 100-meter radius and recording results, so everyone is familiar with the routine before a real case arrives.

Example Field Perspective

"The biggest change wasn't just the machine; it was having a plan everyone understood. When the health promoting hospital reports a case, the volunteers go and tell every household within a hundred meters to get ready. By six the next morning we're already fogging. The light stainless machine lets our younger staff cover every house without constant breaks. Seven days later we come back for the second round, and in between the volunteers tip out containers and add larvicide. This year, after the first case in the village, we didn't see follow-on cases in the same lane. People started calling to thank us instead of complaining."

Note: this is a composite example reflecting the common experience of local government staff and village health volunteers. It is not a quote from any specific person or agency.

Frequently Asked Questions

1. Why fog within 100 meters of a patient's home?

Aedes mosquitoes that bit the patient may carry the virus and move between nearby homes. Covering a radius of about 100 meters reduces the chance that infected mosquitoes will bite others, and it is a widely used approach in disease control practice.

2. How many rounds are enough?

Generally at least two rounds about seven days apart are recommended, to deal with the new generation emerging from eggs and larvae. Always follow local health authority guidance and the actual situation.

3. If we fog thoroughly, do we still need the 3 Keeps?

Absolutely. Fogging reduces adult mosquitoes quickly but does not remove larvae in containers. Keeping homes clean, waste collected and water covered is the heart of long-term prevention. Both must happen together.

4. When is the best time to fog?

Early morning or late afternoon, when Aedes are active and the air is still. The fog stays low and lingers. Avoid strong sun, strong wind and rain.

5. What chemicals can the AT35 use?

The AT35 works with both water-based and oil-based chemicals. Use products properly registered for public health use and mix them at the rate shown on the label every time.

6. Is thermal fogging safe for residents?

When registered chemicals are used at label rates and safety steps are followed, such as covering food, moving small children, sick people and pets out temporarily, and waiting for the fog to clear before re-entering, the risk is greatly reduced. Operators must always wear personal protective equipment.

7. How many thermal foggers should a local government own?

It depends on area size, number of villages and outbreak history. As a rule, have at least one main unit and one backup so fogging can continue when several sites need attention or one machine is being serviced. The WHD team is happy to help assess your needs.

Turn Mosquito Spraying into a Disease Control Plan That Works

Request a quotation, get information for your specifications, or ask for advice on planning Aedes control for your local government.

View AT35 Product and Price - Click Here

Government Mosquito and Insect Control Equipment Hub

Tel 065-556-6294 · LINE @whd268 · worldhealthdisinfection@gmail.com

World Health Disinfection Co., Ltd., 88 268 Kanlapaphruek Road, Bang Khae, Bangkok 10160

Related Articles and Resources

• Government mosquito and insect control equipment hub
• AIROSTAR cordless battery ULV sprayer for indoor areas
• UM2 pickup-mounted two-nozzle ULV sprayer
• Department of Disease Control, Ministry of Public Health
• WHO: Vector-borne diseases

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